CN112158941A - Fenton optimization oxidation treatment method for wastewater - Google Patents
Fenton optimization oxidation treatment method for wastewater Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention belongs to the technical field of wastewater treatment, and discloses a method for Fenton optimized oxidation treatment of wastewater. The treatment method can degrade organic matters in the wastewater in a targeted manner by controlling the addition point, the addition amount and the pH adjusting point of the hydrogen peroxide and the ferrous sulfate. The treatment method is simple to operate, more forward treatment directions of the Fenton reaction can be achieved, the amount of hydrogen peroxide, ferrous ions, early-stage acid regulation amount and later-stage alkali regulation amount is reduced, the medicine utilization rate is improved, the treatment cost is reduced, the Fenton reaction is more thorough, and the problems that the medicine adding amount is large and the removal effect is poor when the waste liquid treatment is optimized are solved.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating wastewater through Fenton optimization oxidation.
Background
Some modern industries produce high COD waste water during their operation. COD is used to characterize the amount of oxidizable substances in wastewater and refers to the chemical oxygen demand, also known as chemical oxygen consumption, of the wastewater. The Fenton reaction can oxidize and remove oxidizable substances (such as refractory organic matters and the like) in the wastewater, effectively treat the wastewater and reduce the COD of the wastewater.
The principle of fenton oxidation is that ferrous ions combine with hydrogen peroxide to form hydroxyl radicals with high reactivity. Hydroxyl radicals are very oxidizing, about twice as much as oxygen, and are located between atomic oxygen and fluorine, so they can interact with, for example, most organics to degrade them and eventually oxidize them to water and carbon dioxide.
The fenton reaction has been studied intensively. For example, the 'experimental study on removal of COD in high-salt-content water by Fenton oxidation' in the related document introduces the reaction mechanism of treating COD in water by Fenton oxidation, and the experimental study on the effect of treating COD in high-salt-content tail water is carried out. This document shows that, in the experiment, a suitable amount of H is added to the test raw water sample at normal temperature2O2And Fe2+The highest COD removal rate can reach 33 percent.
In the traditional Fenton process, alkali is added into a system to adjust the pH value after the Fenton reaction, so that a large amount of iron mud, also called 'Fenton iron mud', is precipitated in the system. "Fenton iron sludge" refers to the iron-containing precipitate obtained after treatment of wastewater in a Fenton oxidation unit, the main component of which is typically ferric hydroxide. Fenton iron mud can be classified as hazardous solid waste, which can cause secondary pollution if directly entering a landfill.
The related art discloses a Fenton oxidation treatment device and a method for treating high-COD waste liquid. The method comprises adjusting the pH value of the waste liquid, adding iron sulfate into the waste liquid, and adding hydrogen peroxide once or in batches after the iron sulfate is dissolved. The application states that the batch addition of the hydrogen peroxide can reduce the addition amount of ferrous sulfate and the amount of iron mud. In order to realize the batch addition of the hydrogen peroxide, the device comprises a first Fenton reaction vessel, a second Fenton reaction vessel and a third Fenton reaction vessel which are connected in series, and an outlet of the first Fenton reaction vessel, an outlet of the second Fenton reaction vessel and an outlet of the third Fenton reaction vessel are connected with a flocculation precipitation vessel; or a hydrogen peroxide feeding pump is arranged to feed hydrogen peroxide to the Fenton reactor in batches according to a specific proportion. The scheme is that the ferrous sulfate is added to reduce the dosage of ferrous sulfate and the amount of iron mud, and the method needs multistage operation and is relatively complex to operate.
The traditional method carries out Fenton reaction from the beginning of the reaction, namely, the PH of the wastewater is adjusted to 3-4, ferrous ions are added, hydrogen peroxide is added, and hydroxyl radicals generated by the reaction of the hydrogen peroxide and the ferrous ions degrade the wastewater. Ferric ions can be generated by Fenton reaction, waste can be inevitably caused to hydrogen peroxide catalytic decomposition, the oxidation reaction releases heat, the higher the temperature is, the higher the concentration of the ferric ions is, the higher the decomposition rate of the hydrogen peroxide is, and the more waste is; most oxidation reactions produce acidic substances to lower the pH, such as adjusting the pH to 3-4 in the early stage, the acidic substances produced in the reaction process can lower the pH, and the pH of some materials in the reaction process is reduced to 1 or even lower, which affects the reaction and even stops the reaction. Therefore, it is desirable to improve the fenton process to reduce the production of fenton iron sludge.
In the field of wastewater treatment, there is still a need to further improve the fenton oxidation process, to improve the efficiency of the fenton oxidation process for reducing the COD of wastewater, and to reduce the formation of iron sludge, which is a major concern.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention aims to provide a method for Fenton-optimized oxidation treatment of wastewater.
The technical scheme adopted by the invention is as follows: a method of fenton optimized oxidative treatment of wastewater, said treatment method comprising the steps of:
adding an oxidant into the wastewater for reaction, adjusting the pH value after the reaction is finished, and adding a ferrous salt solution for stirring;
and adding the oxidant again for reaction after stirring, adding an alkaline regulator to regulate the pH after the reaction is finished, then adding a flocculating agent and a coagulant aid, standing and settling, removing supernatant, and discharging the precipitate out of the device after filter pressing to finish the treatment of the wastewater.
Preferably, the oxidant comprises hydrogen peroxide.
Preferably, when the wastewater is added with the oxidant for reaction, the volume ratio of the wastewater to the oxidant is 1-2: 0.1 to 1;
the reaction time period includes 30 to 80 minutes, preferably 45 to 70 minutes, and further preferably 60 minutes.
Preferably, the wastewater is added with an oxidant for reaction, and when the pH is adjusted and a ferrite solution is added for stirring after the reaction is finished, the ferrite solution comprises a ferrous sulfate solution;
the mass concentration of ferrous sulfate in the ferrous sulfate solution is 20-25%;
the pH value is adjusted to 3-4;
the mass ratio of the ferrous sulfate solution to the waste water is 0.1-1: 10-100;
the stirring time period includes 4 to 15 minutes, preferably 6 to 12 minutes, and more preferably 10 minutes.
Preferably, the oxidizing agent is added again for Fenton reaction, and the volume ratio of the oxidizing agent to the wastewater is 10-40%;
the reaction time period includes 1 to 3 hours, preferably 1.5 to 2.5 hours, and more preferably 2 hours.
Preferably, the oxidizing agent is added again to carry out the fenton reaction, and after the reaction is finished, an alkaline regulator is added to adjust the pH, wherein the alkaline regulator comprises one or more of a sodium hydroxide aqueous solution, a potassium hydroxide aqueous solution and a calcium hydroxide aqueous solution.
And adjusting the pH value to 8-9.
Preferably, the flocculating agent comprises one or more of polyaluminium chloride, alum, aluminium chlorohydrate, ferric chloride, polyferric sulphate and aluminium sulphate.
Preferably, the coagulant aid comprises one or more of polyacrylamide, bentonite, diatomite, activated carbon, calcium oxide and calcium hydroxide.
Preferably, a flocculating agent and a coagulant aid are added later, and in the static precipitation, the ratio of the total mass of the flocculating agent and the coagulant aid to the mass of the wastewater is not higher than 0.5% -5%;
the mass ratio of the flocculating agent to the coagulant aid is 1-3: 1-2.
Preferably, the length of the still settling time includes 30 to 120 minutes, preferably 45 to 100 minutes, and more preferably 60 minutes.
The invention has the beneficial effects that:
the invention provides a Fenton optimized oxidation treatment method for wastewater, which can specifically degrade organic matters in the wastewater by controlling the addition point, the addition amount and the pH adjusting point of hydrogen peroxide and ferrous sulfate. The treatment method is simple to operate, more forward treatment directions of the Fenton reaction can be achieved, the amount of hydrogen peroxide, ferrous ions, early-stage acid regulation amount and later-stage alkali regulation amount is reduced, the medicine utilization rate is improved, the treatment cost is reduced, the Fenton reaction is more thorough, and the problems that the medicine adding amount is large and the removal effect is poor when the waste liquid treatment is optimized are solved.
Drawings
FIG. 1 is a reaction flow chart of an embodiment of the above-described method for Fenton-optimized oxidative treatment of wastewater.
Detailed Description
The present invention is further illustrated below with reference to specific examples. It will be appreciated by those skilled in the art that the following examples, which are set forth to illustrate the present invention, are intended to be part of the present invention, but not to be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples were carried out under the conventional conditions, unless otherwise specified. The reagents used are all conventional products which are commercially available.
Example 1:
a Fenton optimized oxidation treatment method for wastewater comprises the following steps:
adding hydrogen peroxide into the wastewater for reaction, after the reaction lasts for 30 minutes, because the concentration of the wastewater which can be oxidized by the hydrogen peroxide is very low, the reaction rate is obviously reduced, the residual hydrogen peroxide and the wastewater material are reacted for 30 minutes, after the reaction is finished, adjusting the pH value to 3-4, adding a ferrous sulfate solution (the mass concentration of ferrous sulfate is 20 percent), and stirring for 4 minutes;
then adding hydrogen peroxide for reaction again, controlling the pH value to be not lower than 2 and the temperature to be not higher than 45 ℃ in the reaction process, after the reaction is carried out for 1 hour, adding sodium hydroxide aqueous solution (the mass concentration is 30%) to adjust the pH value to 8-9, then adding aluminum chloride and polyacrylamide, carrying out static sedimentation for 30 minutes, discharging supernate to enter a biochemical system, carrying out filter pressing on sediment, and then discharging the sediment out of a device to finish the treatment of wastewater. And (4) conveying filter mud generated by filter pressing to the outside as secondary dangerous waste.
In the above embodiment, when hydrogen peroxide is added into the wastewater for reaction, a relevant technician can visually measure the reaction rate and the reaction temperature, and when the reaction rate is slowed and heat is not released any more, the starch potassium iodide test paper is used for measuring the oxidation property, and the test paper rapidly turns blue, which indicates that the hydrogen peroxide is excessive and the residual materials cannot be oxidized by the hydrogen peroxide.
In the above examples, concentrated sulfuric acid or 30% sodium hydroxide aqueous solution was used to adjust the pH to 3-4.
In the actual operation process of all the embodiments, the selected filter pressing device comprises a plate-and-frame filter press, and is made of stainless steel materials, and the specification and the model are as follows: x (AM) G30/870-30U, manufacturer: shanghai Shangding machinery, Inc. The selection of the filter pressing device is not limited to the above, and all devices which can complete the corresponding filter pressing work and have no influence on the whole reaction belong to the protection scope of the invention.
In the actual operation process of all the embodiments, the selected stirring device comprises a three-dimensional motion mixer, stainless steel materials with specification models of SYH-30 and SYH-1000, and manufacturers: jiangyin and Rong mechanical Co. The selection of the stirring device is not limited to the above, and all devices which can complete the corresponding stirring work and have no influence on raw materials belong to the protection scope of the invention.
The reaction scheme of the treatment method is shown in the attached figure 1.
Example 2:
a Fenton optimized oxidation treatment method for wastewater comprises the following steps:
adding hydrogen peroxide into the wastewater for reaction, after the reaction lasts for 80 minutes, because the concentration of the wastewater which can be oxidized by the hydrogen peroxide is very low, the reaction rate is obviously reduced, the residual hydrogen peroxide and the wastewater material are reacted for 120 minutes, the pH value is adjusted to 3-4 after the reaction is finished, and adding a ferrous sulfate solution (the mass concentration of ferrous sulfate is 25 percent) and stirring for 15 minutes;
then adding hydrogen peroxide for reaction again, controlling the pH value to be not lower than 2 and the temperature to be not higher than 45 ℃ in the reaction process, after the reaction is carried out for 3 hours, adding potassium hydroxide aqueous solution (the mass concentration is 30 percent) to adjust the pH value to 8-9, then adding alum and bentonite, carrying out static sedimentation for 80 minutes, discharging supernate to enter a biochemical system, carrying out filter pressing on sediment, and then discharging the sediment out of a device to finish the treatment of wastewater. And (4) conveying filter mud generated by filter pressing to the outside as secondary dangerous waste.
In the above embodiment, when hydrogen peroxide is added into the wastewater for reaction, a relevant technician can visually measure the reaction rate and the reaction temperature, and when the reaction rate is slowed and heat is not released any more, the starch potassium iodide test paper is used for measuring the oxidation property, and the test paper rapidly turns blue, which indicates that the hydrogen peroxide is excessive and the residual materials cannot be oxidized by the hydrogen peroxide.
In the above examples, concentrated sulfuric acid or 30% potassium hydroxide aqueous solution is used to adjust the pH to 3-4.
The reaction scheme of the treatment method is shown in the attached figure 1.
Example 3:
a Fenton optimized oxidation treatment method for wastewater comprises the following steps:
adding hydrogen peroxide into the wastewater for reaction, after the reaction lasts for 45 minutes, because the concentration of the wastewater which can be oxidized by the hydrogen peroxide is very low, the reaction rate is obviously reduced, the residual hydrogen peroxide and the wastewater material are reacted for 45 minutes, after the reaction is finished, adjusting the pH value to 3-4, adding a ferrous sulfate solution (the mass concentration of ferrous sulfate is 20 percent), and stirring for 6 minutes;
then adding hydrogen peroxide for reaction again, controlling the pH value to be not lower than 2 and the temperature to be not higher than 45 ℃ in the reaction process, after the reaction is carried out for 1.5 hours, adding a calcium hydroxide aqueous solution (with the mass concentration of 30 percent) to adjust the pH value to be 8-9, then adding basic aluminum chloride and kieselguhr, carrying out static sedimentation for 45 minutes, discharging supernate to enter a biochemical system, and discharging precipitates out of the device after filter pressing to finish the treatment of wastewater. And (4) conveying filter mud generated by filter pressing to the outside as secondary dangerous waste.
In the above embodiment, when hydrogen peroxide is added into the wastewater for reaction, a relevant technician can visually measure the reaction rate and the reaction temperature, and when the reaction rate is slowed and heat is not released any more, the starch potassium iodide test paper is used for measuring the oxidation property, and the test paper rapidly turns blue, which indicates that the hydrogen peroxide is excessive and the residual materials cannot be oxidized by the hydrogen peroxide.
In the above examples, concentrated sulfuric acid or 30% calcium hydroxide aqueous solution is used to adjust the pH to 3-4.
The reaction scheme of the treatment method is shown in the attached figure 1.
Example 4:
a Fenton optimized oxidation treatment method for wastewater comprises the following steps:
adding hydrogen peroxide into the wastewater for reaction, after the reaction lasts for 70 minutes, because the concentration of the wastewater which can be oxidized by the hydrogen peroxide is very low, the reaction rate is obviously reduced, the residual hydrogen peroxide and the wastewater material are reacted for 100 minutes, the pH value is adjusted to 3-4 after the reaction is finished, and adding a ferrous sulfate solution (the mass concentration of ferrous sulfate is 25 percent) and stirring for 12 minutes;
then adding hydrogen peroxide for reaction again, controlling the pH value to be not lower than 2 and the temperature to be not higher than 45 ℃ in the reaction process, after the reaction is carried out for 2.5 hours, adding a potassium hydroxide aqueous solution (with the mass concentration of 30 percent) to adjust the pH value to 8-9, then adding ferric trichloride and active carbon, carrying out static precipitation for 70 minutes, discharging supernate into a biochemical system, carrying out filter pressing on precipitates, and then discharging the precipitates out of the device to finish the treatment of wastewater. And (4) conveying filter mud generated by filter pressing to the outside as secondary dangerous waste.
In the above embodiment, when hydrogen peroxide is added into the wastewater for reaction, a relevant technician can visually measure the reaction rate and the reaction temperature, and when the reaction rate is slowed and heat is not released any more, the starch potassium iodide test paper is used for measuring the oxidation property, and the test paper rapidly turns blue, which indicates that the hydrogen peroxide is excessive and the residual materials cannot be oxidized by the hydrogen peroxide.
In the above examples, concentrated sulfuric acid or 30% potassium hydroxide aqueous solution is used to adjust the pH to 3-4.
The reaction scheme of the treatment method is shown in the attached figure 1.
Example 5:
a Fenton optimized oxidation treatment method for wastewater comprises the following steps:
adding hydrogen peroxide into the wastewater for reaction, after the reaction lasts for 60 minutes, because the concentration of the wastewater which can be oxidized by the hydrogen peroxide is very low, the reaction rate is obviously reduced, the residual hydrogen peroxide and the wastewater material are reacted for 100 minutes, the pH value is adjusted to 3-4 after the reaction is finished, and adding a ferrous sulfate solution (the mass concentration of ferrous sulfate is 20 percent) and stirring for 10 minutes;
then adding hydrogen peroxide for reaction again, controlling the pH value to be not lower than 2 and the temperature to be not higher than 45 ℃ in the reaction process, after the reaction is carried out for 2 hours, adding sodium hydroxide aqueous solution (the mass concentration is 30 percent) to adjust the pH value to 8-9, then adding aluminum sulfate and calcium hydroxide, carrying out static sedimentation for 60 minutes, discharging supernate to enter a biochemical system, carrying out filter pressing on sediment, and then discharging the sediment out of a device to finish the treatment of wastewater. And (4) conveying filter mud generated by filter pressing to the outside as secondary dangerous waste.
In the above embodiment, when hydrogen peroxide is added into the wastewater for reaction, a relevant technician can visually measure the reaction rate and the reaction temperature, and when the reaction rate is slowed and heat is not released any more, the starch potassium iodide test paper is used for measuring the oxidation property, and the test paper rapidly turns blue, which indicates that the hydrogen peroxide is excessive and the residual materials cannot be oxidized by the hydrogen peroxide.
In the above examples, concentrated sulfuric acid or 30% sodium hydroxide aqueous solution was used to adjust the pH to 3-4.
The reaction scheme of the treatment method is shown in the attached figure 1.
Hydrogen peroxide: hydrogen peroxide concentration 30%, manufacturer: huainan Huai a model chemical products marketing Co., Ltd.
Concentrated sulfuric acid: concentrated sulfuric acid concentration 98%, manufacturer: huainan Huai a model chemical products marketing Co., Ltd.
Aqueous sodium hydroxide solution: sodium hydroxide concentration 30%, manufacturer: huainan Huai a model chemical products marketing Co., Ltd.
Flocculating agent: the flocculant is PAC with the preparation concentration of 10 percent, and the manufacturer: huainan Huai a model chemical products marketing Co., Ltd.
Coagulant aid: the coagulant aid is PAM, the preparation concentration is 0.1 percent, and the manufacturer: huainan Huai a model chemical products marketing Co., Ltd.
Ferrous sulfate solution: the preparation concentration of the ferrous sulfate solution is 20%, and the manufacturer: huainan Huai a model chemical products marketing Co., Ltd.
Examples of the experiments
The experimental method comprises the following steps: the wastewater treatment method in example 1 was selected as the experimental group.
The control group is the traditional Fenton method treatment process.
The experimental detection method comprises the following steps: COD was determined by potassium dichromate method.
Chemical Oxygen Demand (COD) (chemical Oxygen demand) is the amount of oxidant consumed by a water sample under certain conditions when treated with a certain amount of strong oxidant. It is an index showing the amount of reducing substances in water. The reducing substances in the water include various organic substances, nitrites, sulfides, ferrous salts and the like. But primarily organic. Therefore, Chemical Oxygen Demand (COD) is often used as an index to measure the content of organic substances in water. The larger the chemical oxygen demand, the more serious the water body is polluted by organic matters. The measurement of Chemical Oxygen Demand (COD) varies with the measurement of reducing substances in a water sample and the measurement method. The most common methods used at present are the acid potassium permanganate oxidation method and the potassium dichromate oxidation method. The potassium permanganate (KMnO4) method has low oxidation rate, but is simple and convenient, and can be used for determining the relative comparison value of the organic matter content in a water sample and cleaning surface water and underground water samples. The potassium dichromate (K2Cr2O7) method has high oxidation rate and good reproducibility, and is suitable for measuring the total amount of organic matters in a water sample in wastewater monitoring.
The three different materials selected in the experiment were: the three materials are A, B, C high COD materials respectively.
Pre-treatment data represent: the pre-treatment data is data detected experimentally before the treatment.
The processed data represent: the processed data is the detected data of the wastewater processed by the method and is used for verifying the processing effect.
The experimental results are as follows:
the experimental result data show that compared with the direct Fenton method, the optimized Fenton method provided in the embodiment has the advantages that when the treatment effects of different materials are the same, the sulfuric acid is saved by 3.4% -7.7%, the hydrogen peroxide is saved by 6.7% -12%, the liquid caustic soda is saved by 2.8% -8.2%, and the higher the material COD is, the more obvious the effect of the optimized method is.
The invention provides a Fenton optimized oxidation treatment method for wastewater, which can specifically degrade organic matters in the wastewater by controlling the addition point, the addition amount and the pH adjusting point of hydrogen peroxide and ferrous sulfate. The treatment method is simple to operate, more forward treatment directions of the Fenton reaction can be achieved, the amount of hydrogen peroxide, ferrous ions, early-stage acid regulation amount and later-stage alkali regulation amount is reduced, the medicine utilization rate is improved, the treatment cost is reduced, the Fenton reaction is more thorough, and the problems that the medicine adding amount is large and the removal effect is poor when the waste liquid treatment is optimized are solved.
While particular embodiments of the present invention have been illustrated and described, it will be appreciated that the present invention is not limited to the above-described alternative embodiments, and that various other forms of product may be devised by anyone in light of the present invention. The foregoing detailed description should not be construed as limiting the scope of the invention, and it will be understood by those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalent substitutions may be made to some or all of the technical features thereof, without departing from the spirit and scope of the invention, and that these modifications or substitutions may not substantially depart from the essence of the corresponding technical solutions.
Claims (10)
1. A Fenton optimized oxidation treatment method for wastewater is characterized by comprising the following steps:
adding an oxidant into the wastewater for reaction, adjusting the pH value after the reaction is finished, and adding a ferrous salt solution for stirring;
and adding the oxidant again for reaction after stirring, adding an alkaline regulator to regulate the pH after the reaction is finished, then adding a flocculating agent and a coagulant aid, standing and settling, removing supernatant, and discharging the precipitate out of the device after filter pressing to finish the treatment of the wastewater.
2. A method for fenton's optimized oxidative treatment of wastewater according to claim 1, wherein said oxidizing agent comprises hydrogen peroxide.
3. A fenton's optimized oxidation treatment method for wastewater according to claim 1, wherein the volume ratio of the wastewater to the oxidant is 1-2: 0.1 to 1;
the reaction time period includes 30 to 80 minutes, preferably 45 to 70 minutes, and further preferably 60 minutes.
4. A Fenton's optimization oxidation treatment method for wastewater according to claim 1, wherein the wastewater is added with an oxidant for reaction, and after the reaction is completed, the pH is adjusted and a ferrous salt solution is added and stirred, wherein the ferrous salt solution comprises a ferrous sulfate solution;
the mass concentration of ferrous sulfate in the ferrous sulfate solution is 20-25%;
the pH value is adjusted to 3-4;
the mass ratio of the ferrous sulfate solution to the waste water is 0.1-1: 10-100;
the stirring time period includes 4 to 15 minutes, preferably 6 to 12 minutes, and more preferably 10 minutes.
5. A Fenton's optimization oxidation treatment method of waste water according to claim 1, characterized in that the oxidizing agent is added again to carry out the Fenton reaction, and the volume ratio of the oxidizing agent to the waste water is 10% -40%;
the reaction time period includes 1 to 3 hours, preferably 1.5 to 2.5 hours, and more preferably 2 hours.
6. A Fenton's optimization oxidation treatment wastewater method according to claim 1, characterized in that the oxidizing agent is added again to carry out the Fenton's reaction, and after the reaction is completed, an alkaline regulator is added to adjust the pH, wherein the alkaline regulator comprises one or more of a sodium hydroxide aqueous solution, a potassium hydroxide aqueous solution and a calcium hydroxide aqueous solution.
And adjusting the pH value to 8-9.
7. A method for fenton's optimized oxidative treatment of wastewater according to claim 1, wherein the flocculant comprises one or more of polyaluminium chloride, alum, aluminum chlorohydrate, ferric chloride, polyferric sulfate and aluminum sulfate.
8. A fenton's optimized oxidative treatment of wastewater method according to claim 1, wherein the coagulant aid comprises one or more of polyacrylamide, bentonite, diatomaceous earth, activated carbon, calcium oxide and calcium hydroxide.
9. A Fenton's optimization oxidation treatment method of waste water according to claim 1, characterized in that flocculant and coagulant aid are added afterwards, and in the process of static settlement, the ratio of the total mass of the flocculant and coagulant aid to the mass of waste water is not higher than 0.5% -5%;
the mass ratio of the flocculating agent to the coagulant aid is 1-3: 1-2.
10. A method for fenton's optimized oxidative treatment of wastewater according to claim 1, wherein the length of the rest period comprises 30-120 minutes, preferably 45-100 minutes, and more preferably 60 minutes.
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| CN113213431A (en) * | 2021-05-27 | 2021-08-06 | 黎明化工研究设计院有限责任公司 | Process for producing hydrogen peroxide by high-efficiency anthraquinone method |
| CN114084999A (en) * | 2021-11-12 | 2022-02-25 | 老河口瑞祥化工有限公司 | Fenton process landfill leachate treatment method |
| CN115259442A (en) * | 2022-07-08 | 2022-11-01 | 广西壮族自治区环境保护科学研究院 | Remediation method for heavy metal chromium-organic solvent composite polluted groundwater |
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| CN113213431A (en) * | 2021-05-27 | 2021-08-06 | 黎明化工研究设计院有限责任公司 | Process for producing hydrogen peroxide by high-efficiency anthraquinone method |
| CN114084999A (en) * | 2021-11-12 | 2022-02-25 | 老河口瑞祥化工有限公司 | Fenton process landfill leachate treatment method |
| CN115259442A (en) * | 2022-07-08 | 2022-11-01 | 广西壮族自治区环境保护科学研究院 | Remediation method for heavy metal chromium-organic solvent composite polluted groundwater |
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